Excavating dipper



M Ww? W. J. MULLALLY- EXCAVATING DIFFER Filed Aprill l5, 1927 2 Sheets-5heet W. .1. MULLALLY TM" EXCAVATING DIFFER Fixed April 15, 1927' 2, shemsneei 2 WW @2255 a Fatented ay 6, '1930 ITED STATES WALTER J'. MULLALLY, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR T0 AMERICAN MANGANESE STEEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F MAINE i i EXCAVATING- DIPPER .Application led April 15,

by one of said parts which forms an auxiliary ont. Dippers of the type herein described have been commonly ca'st from manganese steel in two main portions, a front and a back.

The parts are adapted to be riveted together along an overlapping seam and the bail brackets have been riveted, in the usual construction, partially to the back and partially to the front whereby the stresses upon the rivets of theside seams are somewhat reduced. The

digging lip which forms the forward edge of the front receives the 'greater amount of the wear and has been sometimes made removable, but ordinarily the dipper teeth them- 2o selves are formed with rearwardly extending Shanks which form wear ribs protecting the outside of the front. In one design, however, the front has been cast with a double wall having spaced integral truss webs which define sockets, along the front edge of the dou ble walliront, in which the Shanks of' the dipper teeth may be held. In such' a construction the outside wall of the integral double wall front is entirely exposed to Wear as so it drags on the ground;-4 Therefore, after a period ofuse the entire front may require replacement. Dipper buckets arenow constructed to have'a capacity of six or eight v yards and such size renders replacement of the entire front vin the field impossible.

It is, therefore, the purpose of my invention to so" design the bucket construction that the advantages of Securing the' Shanks of the dipper teeth within sqckets formed along the 40 forward edge are preserved while, at the same time, thebucket is 'soreonstructed that thev wear may be readily repiaedaj In carrying out my. general purpose, it

parts which receive thenajorportion ofthe is an object of my invention to iorm the dipper front with a smooth surface both on the insidegand outside and to secure an auxiliary front to the main front so that shankreceiving sockets -are provided along the :Eor-

ward edge between the two fronts.

'1927. Serial No. 183,970.

It is further an object of my invention to so form the auxiliary front that the Jforward edge of the main front is protected from wear by an abutting portion or projections from the auxiliary front.

Another object of my invention is to Jform the auxiliary front withpfrearwardly extending wear ribs which abut against the outer Surface of the main front.

With these and variousother objects.l in view,- the invention consists of certainnovel features of construction and operation as will be more'fully described and particularly pointed out in the specification, drawingsand claims appended hereto.

In the drawings, wherein like reference characters are used to designate like parts- Figure 1 is a side elevation of a dipper bucket provided with the auxiliary front and removable teeth; i

Figure 2is a plan view showing the remov- .able teeth as applied to the auxiliary front sockets;

`Figure 3 is a cross 'section of Figure 2 taken through the auxiliary front sockets and Shanks of the dipper teeth; .y

Figure 4 is a modification of the auxiliary front having a cast integral base and removable points; l

Figure 5 isa plan view of a mud lip having fastening portions adapted to be applied in the teeth sockets; v

Figure 6 is a modification in section of a particular form of teeth which may be applied to the auxiliary front;

Fi re 7 is a section taken through the auxiliary front and dipper front, substantially on line 7-7 of Figure 3; and

Figure 8 is a perspective of another form of tooth adapted to be used with the invention.

Figure 1 shows the general construction comprising the back A, connected to a main front B, the forward outer ortion of which is covered by the auxiliary ront C and havling the usual door D pivoted to the back A.

The main front B is provided with a latch E of ordinary construction adapted to latch the door D.

More particularly, the dipper bucket 1 is provided with the usual front 2, the connection between the dipper back and front being by suitable fastening means through alapped n joint as shown in Figure :3. An auxiliary 5 front 3 is riveted or otherwise secured by suitable means 20 to the dipper front, and' y said auxiliary front may conveniently be provided with the dipper bail bracket 21 which,

in the form shown, is also riveted or fasto work are Aeliminated from .the connecting seam of the main front and the back of the dipper, as can be readilyappreciated. The auxiliary front 3 is recessed at suitable intervals as at 7 and is provided with spacers or ribs 4 lforming sockets adapted to support y The front may be also reinforced by the prodipper teeth or lip shanks. Said auxiliary front is provided with a front contacting and fastening portion 5 `which is integral with the sockets and supports thebail bracket.

vision of rearwardly extending webs 18 from the auxiliary front which cover a portion of the outside'oftle nain front and receive the wear. As will be evident from Figure 2,

43o the ribs extend generally in line with the dipper teeth 4.

VIt will further be evident from Figures 2 and -7 that the auxiliary front is provided with upward projections 19 which cover the forward edge of the main front between the dipperteeth, thus together with the projections which are formed integral with the teeth, the entire forward edge of the mainv front is covered against wear. In a modi! l'ication later to be described in which a tooth base is formed integral with the auxiliary front, the projections 19 are in thc form of a continuous abutment extending along the forward edge of the main front, see Figure 7, instead of being separated, as shown in Figure 2. -Besides forming a wear protection for the main front, the projections 19 prevent the entire stress from falling on the fastening rivets 8.

As shown in Figure 7 the recesses 7 of Figure 3 are really of double formation as indicated at 14, in thedirection of the length of the teeth, and provide spacing members 15 through which the auxihary front rivets 8a are adapted to pass to fasten -the auxiliary front to the dipper front.' It will further be seen that the 'auxiliary front is here provided with inwa'dly projecting portions (not numbered) which engage the main front. With such construction, it vwill readily be. appreciated that shearing stresses are eliminated from the rivets 8a, any stresses incident to work being transmitted to the main front by the projecting portions.

In the modification shown inFigure 4, the

core 4d extending back into the shank 4h of the tooth,v said tooth being'fastened by the usual rivet 8 ;but it will be understood that vany tooth, such as that shown in Figure 8,

may be usedwherein no lightening cores are provided, theY tooth'takingfthe usual form ,having shoulders-'1 6 and 17 forl contact with the front and auxiliary `front respectively,

thereby taking shear olf of the fastening rivets 8 which extend through the usual hole' 11 provided l'in the shank 4. A mud lip may be provided, such as 4, shown in Figure 5 asstraight, but it will be understood that said lipfmay conveniently be formed of arcuate or any other shape, the lip being provided Witlr'a plurality of Shanks lOzprovided with rivet holes 11, which Shanks are adapted to fit in the sockets formed in the auxiliary front and fastened by usual rivets 8.

It will be seen that fromthe construction shown that the three-piece dipper vis'perfectly smooth on the inside, there being no projections, such as dipper teeth or lips, to

extend therein; therefore, there will be free and easy passage of`ythe material through the dipper. .It will also be seen that the rei-nforcingribs which form the sockets form strength `members such as to prevent the main` front from vbulging out of shape or wearing. In case any teeth are broken or it is desired to transform the dipper from stone to.` mudwork,- it is only necessary to remove the rivets 8 which hold the teeth and replace said teeth with otherteeth or the mud lip.. This is par-v ticularly desirable as it is simple, the main parts o'f the dipper do not have tgberemoved and the work may be performed in the field without the necessity of4v having machines to handle the heavy parts of the dipper.

From my description it will be apparent that buckets of large size may be easily designed and cast in threeparts and, in use,

the mainv front will be protected te. `,a .large l extent from receiving wear. in `digg'ng-'operation, primarily due to the constiction, of the auxlliary front in such a mannenthat the usual digging lip of the 'main fro; t is" covered. -The auxiliary ily replaced inthelield; v It is to be understood that the modific`a\.A tions shown are merely by way of illustres tion and 'not'by way'of limitation as many and various forms will occur to those skilled` in the art. a

Lclaim:l v 1. In a device ofthe` character described,

front may bere the combination of a dipper front, ai'. auxiliary front, s aid auxiliary front having reinforcing ribs oi' spacers abutting the main ront,rmeans formed integral with said auxiliary front for protecting the forward 4edge of the main front and removable scraping means disposed between the -front and auxiliary front.

2. In a device of the character described, the combination of a dipper front, an auxiliary front, said auxiliary front having reinforcing-ribs or spacers abutting `the main front, means formed integral with said auX- iliary front `for protecting the forwarded-ge of the main front, removable scraping means disposed between the front and auxiliary front, and having shoulders cooperatively engaging said front and auxiliary front whereby shearing stresses are removed from the fastening rivets. V

3. In a dipper, the combination-of bucket forming members7 a closure'supported by said members, anauxiliary front carried by one of said members and having portions forming sockets'therewith, extensionsTon said auxiliary front contacting with the member carrying said front, Vprojections formed integral with said auxiliary front adapted to formthe digging edge of the dipper and scraping means supported in said sockets.,

4. In a dip er, the` combination of bucket forming mem ers including a front, a ribbed member secured to said front with the ribs thereof in socket forming relation with said front, said member having projections eng'aging saidl front to thereby relieve securing means between said front and member of shear. v

5. In a dipper construction; a mainfront i 'having a smooth inner surface, an auxiliary front attached to the outside of said main front, said .auxiliary front provided with ribs abutting said mainfront whereby shankreceiving sockets are formed, means forming a digging lip integral with said auxiliary front and. covering the forward edge of the main front. D

6. In a dipper construction, a main front, an auxiliar front attached to the outside of said main ont, said auxiliary front having a forwardly and upwardly projecting portion adapted to abut against the forward edge of the main front and receive the wear, and dipper teeth received between said main and auxiliary fronts.

Signed at Chicago Heights, Illinois, this 7th day of April, 1927.

WALTER J. MULLALLY. 

